Add OSM support

I found out that the class EarthSatellite of skifield.api took inputs only in forms of the line1 and line 2. So the goal was to convert the JSON-osm string to tle. While figuring out ways on how it is to be done I found a piece of code in the libre-space IRC channel which helps convert OSM Json to TLE however it had some major errors and had to be corrected. Later will add XML support as well.